, fetches the corresponding product details from a database, and stores them in the $_SESSION['cart'] Basic Code Implementation A simplified version of what the code inside add-cart.php might look like:
Developers use this parameter to pass data from a "Buy Now" or "Add to Cart" button to a backend script. For example: URL Example: ://yourstore.com Script Logic: add-cart.php file receives $_GET['num'] add-cart.php num
// Validate product if ($product_id <= 0) if ($response_type == 'json') echo json_encode(['success' => false, 'error' => 'Invalid product ID']); exit; , fetches the corresponding product details from a
While most developers remember to prevent a user from ordering 0 items, they often forget to handle . 'Invalid product ID'])
$productId = (int)$matches[1]; $quantity = (int)$matches[2]; if ($quantity < 1 || $quantity > 50) die('Quantity out of range');
By sending a single request with an absurdly high num value, or by sending thousands of sequential requests via a simple script, an attacker can flood the cart session.